Skip the auto shop - Our mechanics make house calls

Q: Kia Cerato 2011 jerks when accerating

asked by on

When I initiate drive and accelerate the engine, the car jerks. I also noticed the check engine light comes on and blinks. As I get to about 50Km/Hr I hear a humming sound too with some vibration. It is more eminent when I am using the car air conditioning system and / or the rear screen heater.

A: Your car's engine intake system has som...

Your car's engine intake system has something called a mass air flow sensor that monitors air intake as it is mixed with fuel prior to being injected into the motor. When this fails, this can cause an imbalanced air/fuel load to be supplied to the motor which results in an over fueling or under fueling situation depending on the conditions. This may cause a hesitation, loss of power or jerking reaction when this sensor is malfunctioning. When this is not working properly, you may also notice a strong smell of fuel. I would suggest having a professional from Your Mechanic come to your home to diagnose your mass air flow sensor.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Brake changes on my 2007 Kia Picanto

You may not need brakes but should get them inspected to see if they are worn down or just noisy. If you are having to replaced the brakes every 4000km or six months, then you have issues with the calipers...

Q: Where is the Mass AirFlow (MAF) sensor located on this car? 2005 Saturn L300

Hello - the mass airflow (MAF) sensor is the black plastic cylindrical tube with an electrical harness that goes into the air filter housing on your engine air intake system. I would check for problem codes first however, as the...

Q: Car cranks but won't start below 10 degrees F

Hi there. When you start your car in the morning when it's incredibly cold outside. the coolant temperature sensor immediately reads the temperature of the coolant and relays this to the computer indicating that the coolant is cold. The computer...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.